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Chalcedony is a cryptocrystalline form of silica, composed
of very fine intergrowths of the minerals quartz and moganite. These are both
silica minerals, but the difference is that quartz has a trigonal crystal
structure, while moganite is monoclinic. Chalcedony’s standard formula is SiO2
Chalcedony has a waxy luster; it may be semi transparent or
translucent. It comes in a large range of colors with the most valuable and
sought after being a shade of purplish blue or ‘duck egg blue’as some people
call it. But those most commonly seen
are white to gray, gray-blue or a shade of brown ranging from pale to nearly
Chalcedony became very popular in jewellery in the post art
deco period of the 1930’s to the 1960’s. Some beautiful jewellery designs with
gem grade blue purple chalcedony, can be seen in museums and exhibitions.
The quality of the Blue Chalcedony is judged by the depth of
blue color in the stone. The color of the gemstone also depends on the place of
its origin, for example the Blue Chalcedony from California and Nevada is
moderately grayish blue. Blue Chalcedony from Namibia is called African Blue.
Strong color saturation and high degree of translucency are the other factors
that determine the price of the stone.
Agates, aventurine, carnelian, jasper and chrysophrase are all
examples of the chalcedony group of stones.
Blue Chalcedony also comes from Turkey, Indonesia, and the West Indies.
Healing Properties of Chalcedony
Chalcedony promotes humanity, togetherness and good
will. It absorbs negative energy. It brings the mind, body and spirit
together. Chalcedony encourages
benevolence and generosity; it alleviates hostility and transforms melancholy
into joy. Chalcedony eases low self-esteem. Chalcedony lessens the effects of dementia and senility and
increases both physical and mental energy.
It heals the eyes, gallbladder, bones, spleen, blood and circulatory
system. Blue Chalcedony, specifically is a throat chakra stone. It promotes mental flexibility and verbal
fluency. It stimulates the ability to
learn new languages and improves memory.
It enhances the immune system.
Blue Chalcedony lowers temperature and blood pressure. It heals the
lungs of the effects of smoking.